This transcript has been edited for clarity.
The ongoing longitudinal Nurses’ Health Study has served as an incredible database for evaluating disease states prospectively over decades, thanks to the robust input of its participants. Most recently, this allowed for an important analysis of the association between gastroesophageal reflux (GER) symptoms and sleep quality, the results of which were published in JAMA Network Open.
Approximately 49,000 women with a median age of 59 years (range, 48-69 years) provided data for this analysis. Starting in 2005, they were asked about their experience of GER symptoms. In 2017, they were also asked to respond to a questionnaire, a modified Pittsburgh Sleep Quality Index (PSQI). This is a tool we’ve used a lot in prospective studies looking at gastrointestinal diseases and sleep-related abnormalities. It’s unique in that it looks not only at sleep but also at next-day function and daytime sleepiness, which is important here for its implications related to reflux disease and sleep fragmentation.
For those with GER symptoms occurring once a week and more than once a week, the approximate relative risk increased by 30% and 53%, respectively. Clearly, the association of GER symptoms and relative sleep quality was really important.
It should be noted that the PSQI is a disease-independent, validated instrument. It’s not specific to GER disease or any diseases. It’s cross validated across 17 different languages. I think what’s most important about its use in the assessment here is the incorporation of next-day function and asking participants about daytime sleepiness, which we’ll discuss in more detail shortly.
The many causes of interrupted sleep
We’ve all experienced sleep fragmentation, whether in the form of having been on call during our medical training or common experiences like hearing a child cry in the night, a noisy truck pass by, or a dog barking. You may or may not remember that these happened the next day, but they’ve nonetheless interrupted your sleep efficiency.
When you transition laterally across the stages of sleep, that’s what establishes the circadian rhythm and ensures sleep hygiene. Typically, we require approximately 7 hours of restful sleep to do that. But if you fragment or interrupt this process, you more or less move your way erratically through the night, disrupting sleep hygiene and efficiency.
If you have a cognitive awakening during those disruptions, you may recall those events the next day. Or, you may not remember it at all, and such amnestic events are normal for some people with sleep disruptions.
You may also have a sensory arousal, whether it’s due to GER symptoms, auditory stimuli, bumping your toe, or whatever disruptive event. Any of these can cause you to lose that laterality of smooth transition through sleep.
Approximately 20% of the U.S. population have reported GER symptoms at least once a week. Incident data indicate that number may be increasing by as much as 5% a year. Much of that increase is tied to obesity. But nonetheless, it’s a problem on the rise.
It’s important to know this as we start to look at sleep. If GER is acting as a trigger to sleep disruption, you need to ask your patients with this condition about next-day function.
In particular, the next-day function questions to ask are, “How do you feel when you get up? Are you awake and refreshed? Do you have early fatigue? Do you drag yourself out of bed, have daytime somnolence, loss of concentration, or irritability?”
Those are key parameters we can use for looking back to the night before and gauging sleep efficiency. If you’re not asking those questions, you may miss out on identifying a patient having sleep fragmentation.